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[77.1.66.240]) by smtp.gmail.com with ESMTPSA id e17sm1260065ejl.68.2022.02.17.06.35.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Feb 2022 06:35:06 -0800 (PST) From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= To: selinux@vger.kernel.org Cc: James Morris , "Serge E. Hallyn" , Paul Moore , Stephen Smalley , Eric Paris , Richard Guy Briggs , Ondrej Mosnacek , linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH] selinux: log anon inode class name Date: Thu, 17 Feb 2022 15:34:55 +0100 Message-Id: <20220217143457.75229-1-cgzones@googlemail.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Log the anonymous inode class name in the security hook inode_init_security_anon. This name is the key for name based type transitions on the anon_inode security class on creation. Example: type=AVC msg=audit(02/16/22 22:02:50.585:216) : avc: granted { create } for pid=2136 comm=mariadbd anonclass="[io_uring]" dev="anon_inodefs" ino=6871 scontext=system_u:system_r:mysqld_t:s0 tcontext=system_u:system_r:mysqld_iouring_t:s0 tclass=anon_inode Add a new LSM audit data type holding the inode and the class name. Also warn if the security hook gets called with no name set; currently the only caller fs/anon_inodes.c:anon_inode_make_secure_inode() passes one. Signed-off-by: Christian Göttsche --- include/linux/lsm_audit.h | 5 +++++ security/lsm_audit.c | 21 +++++++++++++++++++++ security/selinux/hooks.c | 7 +++++-- 3 files changed, 31 insertions(+), 2 deletions(-) diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h index 17d02eda9538..8135a88d6d82 100644 --- a/include/linux/lsm_audit.h +++ b/include/linux/lsm_audit.h @@ -76,6 +76,7 @@ struct common_audit_data { #define LSM_AUDIT_DATA_IBENDPORT 14 #define LSM_AUDIT_DATA_LOCKDOWN 15 #define LSM_AUDIT_DATA_NOTIFICATION 16 +#define LSM_AUDIT_DATA_ANONINODE 17 union { struct path path; struct dentry *dentry; @@ -96,6 +97,10 @@ struct common_audit_data { struct lsm_ibpkey_audit *ibpkey; struct lsm_ibendport_audit *ibendport; int reason; + struct { + struct inode *inode; + const char *anonclass; + } anoninode_struct; } u; /* this union contains LSM specific data */ union { diff --git a/security/lsm_audit.c b/security/lsm_audit.c index 1897cbf6fc69..5545fed35539 100644 --- a/security/lsm_audit.c +++ b/security/lsm_audit.c @@ -433,6 +433,27 @@ static void dump_common_audit_data(struct audit_buffer *ab, audit_log_format(ab, " lockdown_reason=\"%s\"", lockdown_reasons[a->u.reason]); break; + case LSM_AUDIT_DATA_ANONINODE: { + struct dentry *dentry; + struct inode *inode; + + rcu_read_lock(); + inode = a->u.anoninode_struct.inode; + dentry = d_find_alias_rcu(inode); + if (dentry) { + audit_log_format(ab, " name="); + spin_lock(&dentry->d_lock); + audit_log_untrustedstring(ab, dentry->d_name.name); + spin_unlock(&dentry->d_lock); + } + audit_log_format(ab, " anonclass="); + audit_log_untrustedstring(ab, a->u.anoninode_struct.anonclass); + audit_log_format(ab, " dev="); + audit_log_untrustedstring(ab, inode->i_sb->s_id); + audit_log_format(ab, " ino=%lu", inode->i_ino); + rcu_read_unlock(); + break; + } } /* switch (a->type) */ } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index dafabb4dcc64..19c831d94d9b 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2932,6 +2932,8 @@ static int selinux_inode_init_security_anon(struct inode *inode, if (unlikely(!selinux_initialized(&selinux_state))) return 0; + WARN_ON(!name); + isec = selinux_inode(inode); /* @@ -2965,8 +2967,9 @@ static int selinux_inode_init_security_anon(struct inode *inode, * allowed to actually create this type of anonymous inode. */ - ad.type = LSM_AUDIT_DATA_INODE; - ad.u.inode = inode; + ad.type = LSM_AUDIT_DATA_ANONINODE; + ad.u.anoninode_struct.inode = inode; + ad.u.anoninode_struct.anonclass = name ? (const char *)name->name : "unknown(null)"; return avc_has_perm(&selinux_state, tsec->sid, -- 2.35.1